Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adc3e24865ee6b8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 11:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 992a249cdb25faf612d1fa867f541eac SHA-1: f28debe2700b31c084d0773e3847388a53b12583 SHA-256: 3adc3e24865ee6b8e55cd6dc8a6e55fcef597b2db3972945af780c8664e7051d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The embedded JavaScript, though not fully detailed, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aaas.handyfriendship.com/upload/files/19074761908.pdf In PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/sudivuvubiku.pdfIn PDF document text
    • https://kiptep.ru/file/65133776723.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/60266105099.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gesefixero.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109010652309828.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/jesapegimafajolidutadun.pdfIn PDF document text
    • http://indexone.ru/upload/file/32016838601.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/midudakubotugiwizep.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/xiwuto.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/jewonutotoligigabu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/31778549536.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/famezuluba.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/99097589702.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/05190707933.pdfIn PDF document text
    • http://teraval.cz/res/file/27513375101.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pboovjvr99s916h9p8drnl6jo3/nanofetipiji.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469e7ad4cb0---95781343654.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/ribijotesewulinivup.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32821407746.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89d1ba9da---16024168535.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/pinubefam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=diagnostic+and+statistical+manual+of+mental+disorders+5th+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 17580 bytes
SHA-256: a04d569178cb84951379823ce9650edb49cd2b02b17b8cfc848f148976be1933
font_01_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 11300 bytes
SHA-256: e4460ccc9d9c0999d0202ed50974c45ecdb9f49a79983addbb02d4a058d09dba
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1